J. Iran. Chem. Soc., Vol. 8, No. 4 December 2011, pp.1073~1081.

Current location: JICS Archive > Vol. 8 > No. 4 > Articles : 22

Cobalt(II), Nickel(II), Copper(II) and Zinc(II) Complexes with New Tetraaza Schiff Base Ligands: Synthesis, Characterization and Thermodynamic Studies

M. Asadia,*, G. Absalana and A. Zamanpoura

aChemistry Department, College of Sciences, Shiraz University, Shiraz 71454, I. R. Iran

New complexes of Co(II), Ni(II), Cu(II) and Zn(II) with four new tetraaza Schiff base ligands, N,N'-bis(2-quinolylmethylidene)-1,2-ethanediimino (L1), N,N'-bis(2-quinolylmethylidene)-1,2-propanediimino (L2), N,N'-bis(2-quinolylmethylidene)-1,3-propanediimino (L3), N,N'-bis(2-quinolylmethylidene)-4-nitro-1,2-phenylenediimine (L4), were synthesized and characterized by elemental analysis, IR, 1H NMR, and UV-Vis spectroscopy. The thermodynamic formation constants of the complexes were measured spectrophotometrically, at the constant ionic strength 0.1 M (NaClO4), at 25 °C in MeOH solvent. The trend of the complex formation of a given metal ion with the ligands was found to be as follows L2 > L1 > L3 > L4 and the trend of a given ligand with the metal ions was Co(II) > Ni(II) > Cu(II) > Zn(II).

Keywords: Complexes, Formation constants, Thermodynamic parameters, Tetraaza Schiff base

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